ohno 0.4.0

High-quality Rust error handling.
Documentation 
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error: Multiple fields marked with `#[error]`. Mark only the field holding the OhnoCore
  --> tests/ui/error_attribute_on_several_fields.rs:11:5
   |
11 |     #[error]
   |     ^^^^^^^^

error: Multiple fields marked with `#[error]`. Mark only the field holding the OhnoCore
  --> tests/ui/error_attribute_on_several_fields.rs:16:58
   |
16 | pub struct TwoMarkedTupleFields(#[error] ohno::OhnoCore, #[error] ohno::OhnoCore);
   |                                                          ^^^^^^^^

error: Duplicate `#[error]` on the same field. Mark it once
  --> tests/ui/error_attribute_on_several_fields.rs:22:5
   |
22 |     #[error]
   |     ^^^^^^^^